This is the problem with society and kids today. You do this in a public place and the kid flat out owns your butt. My wife is a school teacher (4th) grade, in California. She puts up with a lot of crap. Basically she is an underpaid day care provider that is about to take a 6% pay cut. I'll save that for another thread though.
If I did that when I was 10 my folks (which btw would have been there with me) would have told me to shut up. If it escalated to the point that it did they would have made me apologize to the man, then when I home they would have kicked my ass. It's all about the parenting. I wouldn't dare let my 10 year old daughter go to the movies without adult supervision.